Revealing the source of Jupiter's x-ray auroral flares.
Revealing the source of Jupiter's x-ray auroral flares.
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DOI：
10.1126/sciadv.abf0851
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发表时间：
2021-07
期刊：
影响因子：
13.6
通讯作者：
Bolton SJ
中科院分区：
文献类型：
--
作者：
Yao Z;Dunn WR;Woodfield EE;Clark G;Mauk BH;Ebert RW;Grodent D;Bonfond B;Pan D;Rae IJ;Ni B;Guo R;Branduardi-Raymont G;Wibisono AD;Rodriguez P;Kotsiaros S;Ness JU;Allegrini F;Kurth WS;Gladstone GR;Kraft R;Sulaiman AH;Manners H;Desai RT;Bolton SJ
木星独特的x射线极光是由与地球相同的过程驱动的：电磁波的重离子散射。木星快速旋转的强磁场提供了一个天然的实验室，这是理解高能等离子体动力学的关键。壮观的极光x射线耀斑是控制磁层的最具能量过程的诊断，但似乎是木星独有的。自从40年前被发现以来，产生木星x射线耀斑的过程一直不为人知。在这里，我们报告了同步的原位卫星和太空望远镜观测，揭示了产生木星x射线耀斑的过程，显示出与地球离子极光惊人的相似之处。观测到行星尺度的电磁波可以调制电磁离子回旋波，周期性地引起重离子沉淀并产生木星的x射线脉冲。我们的研究结果表明，尽管时间、空间和能量尺度在数量级上存在差异，但离子极光在行星系统中具有共同的机制。
Jupiter’s unique x-ray aurora is driven by the same processes as Earth’s: Heavy ion scattering by electromagnetic waves. Jupiter’s rapidly rotating, strong magnetic field provides a natural laboratory that is key to understanding the dynamics of high-energy plasmas. Spectacular auroral x-ray flares are diagnostic of the most energetic processes governing magnetospheres but seemingly unique to Jupiter. Since their discovery 40 years ago, the processes that produce Jupiter’s x-ray flares have remained unknown. Here, we report simultaneous in situ satellite and space-based telescope observations that reveal the processes that produce Jupiter’s x-ray flares, showing surprising similarities to terrestrial ion aurora. Planetary-scale electromagnetic waves are observed to modulate electromagnetic ion cyclotron waves, periodically causing heavy ions to precipitate and produce Jupiter’s x-ray pulses. Our findings show that ion aurorae share common mechanisms across planetary systems, despite temporal, spatial, and energetic scales varying by orders of magnitude.
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